Insulating mass especially for electric use.



JOHANNES ANDERSEN, 0F LILLEHAMMER, NORWAY.

INSULATING MASS ESPECIALLY FOR ELECTRIC USE.

No Drawing.

To all whom it may concern:

Be it known that I, J OHANNES ANDERSEN, citizen of Norway, residing at Lillehammer, Norway, have invented new and useful Improvements in an Insulatin Mass Espe-- cially for Electric Use, of which the follow-' mg is a specification.

My invention relates to insulating compositions more particularly intended for electrical purposes.

Electric insulating masses or compositions as hitherto used are objectionable-in many respects.

The usually employed composition is expensive and when hardened is rather brittle at low temperatures, so that it' easily fractures. When exposed to heat it becomes plastic, and is therefore generally warmed before it is placed in position. This property, however, is frequently detrimental because the heat of the sun is sufiicient to make the mass plasticto such a degree that it gets out of shape, and if subjected to greater heat, as may easily happen in many electric plants, the mass may completely melt and run off.

My invention has for its object to produce an insulating mass which is free from the defects above referred to. Its principal constituent is Norwegian steatite (talc) or soapstone in a more or less pulverized state held together by a suitable binder.

The binder may be varied and may conof resin and linseed oil, of shellac or the The principal constituent, the Norwegian steatite (talc) (klaebersten) is, among the Norwegian natural stones, the kind which is least affected by acids and by direct heat. Furthermore it has great resistance to rapid variations of temperature and is very effective for insulating electric currents. It therefore is an efficient electric insulator.

As an example of a good insulating composition the following proportions may. be employed.

Steatite (talc) powder Resin u 40%. Linseed oil 10% The linseed oil is first somewhat concentrated, by boiling, and then the resin is added. When these two substances have been well boiled together, the steatite (talc) Specification of letters Patent.

Patented Nov. 26, 1918.

Application filed June 1, 19l6. Serial No. 101,111.-

' it is filled for the purpose of serving as an insulator and will therefore not run off. Even if the binder should burn, the steatite (talc) remains around the cables, etc., in a pulverized state, so that it still acts as an insulator. 7

As the mass is very elastic, it need not be heated before being-used, for instance, as an insulation for conductors. A thin disk may be cut off, which is kneaded for a few moments between the fingers, when the mass on account of its elasticity can be easily placed upon any cable.

The mass has a heat extension coefficient which is practically zero. Moreover there is no trace of hygroscopieity.

An example of the use of shellac as a binder is as follows:

Steatite (talc) 50% Shellac 20% and some drops of alcohol for dissolving the shellac. This mass possesses about the same properties as that first described.

I claim as my invention:

An insulating composition comprising powdered steatite (talc) and a mixture of resin and linseed oil in about the following proportions Steatite (talc) 50% Resin 40% Linseed oil 10% In testimony whereof have signed my name to this specification 1n the presence of .two subscribing witnesses.

J OHANNES ANDERSEN.

/Vitnesses AxEL LAHN, MAGENS Boson. 

